pcap_rw: Fix compiler warnings

Fix the following compiler warnings that occur when building with "-W
-Wall -Wextra":

pcap_rw.c: In function ‘pcap_rw_write’:
pcap_rw.c:30:6: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
pcap_rw.c: In function ‘pcap_rw_read’:
pcap_rw.c:50:6: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 2 insertions, 2 deletions

diff --git a/pcap_rw.c b/pcap_rw.c
index 65b45cb..5a739da 100644
--- a/pcap_rw.c
+++ b/pcap_rw.c
@@ -27,7 +27,7 @@ static ssize_t pcap_rw_write(int fd, pcap_pkthdr_t *phdr, enum pcap_type type,
 		panic("Failed to write pkt header!\n");
 
 	hdrlen = pcap_get_length(phdr, type);
-	if (unlikely(hdrlen != len))
+	if (unlikely(hdrlen != (ssize_t) len))
 		return -EINVAL;
 
 	ret = write_or_die(fd, packet, hdrlen);
@@ -47,7 +47,7 @@ static ssize_t pcap_rw_read(int fd, pcap_pkthdr_t *phdr, enum pcap_type type,
 		return -EIO;
 
 	hdrlen = pcap_get_length(phdr, type);
-	if (unlikely(hdrlen == 0 || hdrlen > len))
+	if (unlikely(hdrlen == 0 || hdrlen > (ssize_t) len))
                 return -EINVAL;
 
 	ret = read(fd, packet, hdrlen);